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Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Corrosion
This steel like any other steel when distorted by cold worki...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Care In Annealing
Not only will benefits in machining be found by careful anne...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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